CN104578316A - Battery pack distribution multi-mode equalizing charge method and equalizing charge circuit - Google Patents
Battery pack distribution multi-mode equalizing charge method and equalizing charge circuit Download PDFInfo
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- CN104578316A CN104578316A CN201510043939.0A CN201510043939A CN104578316A CN 104578316 A CN104578316 A CN 104578316A CN 201510043939 A CN201510043939 A CN 201510043939A CN 104578316 A CN104578316 A CN 104578316A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0014—Circuits for equalisation of charge between batteries
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
- H01M10/441—Methods for charging or discharging for several batteries or cells simultaneously or sequentially
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Manufacturing & Machinery (AREA)
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- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Power Engineering (AREA)
- Secondary Cells (AREA)
Abstract
The invention provides a battery pack distribution multi-mode equalizing charge method and an equalizing charge circuit. In the traditional equalizing charge mode, a whole battery pack of an electric automobile is charged repeatedly through high voltage and large current, and discharge of single batteries approximates circularly. By the battery pack distribution multi-mode equalizing charge method, after a whole battery pack is charged through high voltage and large current, charge of the whole battery package is stopped once a battery in the battery pack is fully charged, and then various single batteries in the battery pack are charged through low voltage and small current until all the batteries in the battery pack are fully charged. Compared with the traditional mode, the method is energy-saving, environment-friendly, quick and effective; an error accumulation effect caused by the traditional charging mode is avoided owing to charging of the single batteries, the temperature of the battery pack rises slightly in a charging process because a discharge resistor which can generate heat during discharge in the traditional circuit is omitted, and the service life of the battery pack is greatly prolonged.
Description
Technical field
The present invention relates to electric powered motor field, refer in particular to a kind of battery pack distribution multi-mode balanced charging method and equalization charging circuit.
Background technology
Because electric automobile drives operation by electric power, and the electrical power storage of existing mature technology is only had and is realized by battery, and therefore for electric automobile, the battery case that multiple battery is formed is essential as energy storage supply.In order to make to enter in battery by power storage, the step that is absolutely necessary of charging.And power is larger required for electric automobile, therefore its battery case total capacity is also very large, such as a kind of typical automobile power cell case comprises 12 battery pack in parallel, each battery pack is in series by 108 18650 type lithium batteries, in order to charge to so a large amount of battery, existing method is that corresponding each battery pack carries out charging control respectively, each battery pack is comprised to 108 18650 type lithium batteries of series connection, the charging voltage of each battery is generally: 4.20V-4.3V, therefore BMS can directly use 460V voltage to batteries charging, simultaneously, be in the design needs of quick charge, charging current peak value can reach 360A.But due to the lithium battery individual difference of connecting in battery pack, therefore usually cannot realize disposablely being full of the full battery of battery pack, this namely needs to configure the reason that BMS controls charging.And the balanced charging method step that existing BMS adopts battery pack:
1) employing high voltage, big current charge to whole group;
2) whether the voltage detecting each battery in battery pack reaches pre-set peak value voltage, if reach, then performs step 3;
3) stop the charging to battery pack, the battery reaching pre-set peak value voltage is discharged, and whether detects this cell voltage lower than predetermined low level voltage, lower than then performing step 1 from new;
Above-mentioned 3 steps repeat, till in battery pack, all batteries are full of electricity thus.But existing balanced charging method has two obvious drawbacks, one is need repeatedly to battery set charge/discharge, and is full of electricity just theoretical effect, in reality, is repeatedly charge due to what perform cell.The mode of electric discharge, can only approach full power state, oversize when being therefore really full of power consumption; Two is that this kind of charge control method only decides according to a battery in battery pack owing to charging, discharging at every turn, and therefore in repeated charge management process, charging error can add up, and finally causes whole battery life to shorten rapidly.
Summary of the invention
Technical problem to be solved by this invention is: provide a kind of and be applicable to the quick of batteries of electric automobile group and the charging method that harmony is better and charging circuit.
In order to solve the problems of the technologies described above, the technical solution used in the present invention is: a kind of battery pack distribution multi-mode balanced charging method, comprises step,
A) employing high voltage, big current charge to battery pack;
B) voltage of each battery in battery pack is detected;
C) judge in battery pack, whether have single battery to reach pre-set peak value voltage, if then perform step D;
D) stop high voltage, big current to batteries charging;
E) judge whether have single battery not reach pre-set peak value voltage in battery pack, to be perform step F, otherwise charging terminates;
F) low-voltage, small area analysis is adopted to charge to each single battery that in battery pack, all the other do not reach pre-set peak value voltage respectively;
G) judge in battery pack, in all the other single batteries, whether have battery to reach pre-set peak value voltage, if having, perform step H;
H) stopping low-voltage, small area analysis charge to this single battery, return step e.
In above-mentioned, described high voltage is corresponding with assembled battery total voltage, and described big current allows charging current corresponding with battery pack entirety; Described low-voltage is not more than 2.5A higher than 24V, small area analysis; The nominal voltage value of single battery in described pre-set peak value Voltage Reference battery pack.
The invention still further relates to a kind of battery pack distribution multi-mode equalization charging circuit, comprise switch module, battery pack, detection module, BMS module, handover module and charging module;
Described switch module high input voltage, big current, for switching high voltage, big current to batteries charging;
Described battery pack comprises the battery of multiple series connection;
Described detection module, for detecting the voltage of each battery in battery pack;
Described charging module, for generation of low-voltage, small area analysis;
Described handover module, charges to each single battery that in battery pack, all the other do not reach pre-set peak value voltage respectively for switching low-voltage, small area analysis;
Described BMS module, the voltage for detecting each battery according to detection module judges whether have single battery to reach pre-set peak value voltage in battery pack, if then control switch module, switches and stops high voltage, big current to batteries charging; Control handover module subsequently and low-voltage, low current charge are carried out to the single battery not reaching pre-set peak value voltage, until all battery charging completes in battery pack.
In above-mentioned, described detection module connects each battery in battery pack; BMS model calling detection module, BMS model calling switch module and handover module, in the corresponding battery pack of handover module, each battery is provided with a coupled branch road, and charging module connects handover module.
In above-mentioned, described detection module comprises temperature detection, total voltage detection, voltage detecting branch road and current detecting; Wherein in the corresponding battery pack of temperature detection and voltage detecting branch road, each battery is arranged one by one.
In above-mentioned, described charging module comprises DC-DC circuit;
In above-mentioned, described switch module input connects high voltage, the large-current electric source of charging head; Described charging module input connects charging head 12V input head or accumulator of electric car.
Visible, be different from that conventional charging circuit adopts be iterate through high voltage, big current charges to whole Battery pack group, the equalizing charge mode of cyclic approximation of cell electric discharge, beneficial effect of the present invention is: first by external high voltage, big current to the charging of whole group of battery pack, after having a battery to be filled in battery pack, then to transfer in battery pack that other switch to low-voltage less than cell, small area analysis mode is charged, till all batteries are all filled in battery pack to.The method not only comparable traditional approach more energy-conserving and environment-protective and fast effectively outside, and avoid the deviation accumulation effect that traditional charging modes brings due to the charging of cell, in addition the temperature rise that brings battery pack of charging process is low (eliminates the discharge resistance in traditional circuit, conductive discharge can generate heat), the use birthday noodle of battery pack are greatly extended.
Accompanying drawing explanation
Below in conjunction with accompanying drawing in detail concrete structure of the present invention is described in detail
Fig. 1 is method flow schematic diagram of the present invention;
Fig. 2 is electrical block diagram of the present invention;
Fig. 3 is electric current specific embodiment structural representation of the present invention.
Embodiment
By describing technology contents of the present invention, structural feature in detail, realized object and effect, accompanying drawing is coordinated to be explained in detail below in conjunction with execution mode.
Refer to Fig. 1, the invention provides a kind of battery pack distribution multi-mode balanced charging method, comprise step,
A) employing high voltage, big current charge to battery pack;
B) voltage of each battery in battery pack is detected;
C) judge in battery pack, whether have single battery to reach pre-set peak value voltage, if then perform step D;
D) stop high voltage, big current to batteries charging;
E) judge whether have single battery not reach pre-set peak value voltage in battery pack, to be perform step F, otherwise charging terminates;
F) low-voltage, small area analysis is adopted to charge to each single battery that in battery pack, all the other do not reach pre-set peak value voltage respectively;
G) judge in battery pack, in all the other single batteries, whether have battery to reach pre-set peak value voltage, if having, perform step H;
H) stopping low-voltage, small area analysis charge to this single battery, return step e.
From foregoing description, being different from conventional electric automobile batteries group is iterate through high voltage, big current charges to whole Battery pack group, cell electric discharge then whole Battery pack recharges, the equalizing charge mode of the approximatioss that cell discharges again, beneficial effect of the present invention is: pass through high voltage in outside, big current is to after whole group of charging, once detect in battery pack have a battery to be filled, then stop whole group of charging, then to each battery of monomer in battery pack respectively by low-voltage, low current charge, till in battery pack, all batteries are all filled.The method not only comparable traditional approach more energy-conserving and environment-protective and fast effectively outside, and avoid the deviation accumulation effect that traditional charging modes brings due to the charging of cell, in addition the temperature rise that brings battery pack of charging process is low (eliminates the discharge resistance in traditional circuit, conductive discharge can generate heat), the use birthday noodle of battery pack are greatly extended.
Embodiment 1:
In above-mentioned, described high voltage is corresponding with assembled battery total voltage, and described big current allows charging current corresponding with battery pack entirety; Described low-voltage is not more than 2.5A higher than 24V, small area analysis; The nominal voltage value of single battery in described pre-set peak value Voltage Reference battery pack.Described high voltage refers to the needs of the total voltage of battery pack, big current refers to that (such as battery voltage is 500V capacity 100AH allows 1C charging for charging current that battery pack allows, so just can high voltage 500V, big current 100AH be full of at 1 hour, if this battery pack allows 2C charging, the big current that then charges can be 200AH, whole battery pack only needs be full of for 30 minutes, and under precondition, certain charger will have enough power to perform).
Described low-voltage is not higher than 24V, this depends on the auxiliary battery voltage of electric automobile, general car is 12V, mini-bus, big bus, truck is 24V, because boost voltage generally can not more than 24V, so this management system has only done the 24V upper limit, because too high voltage can bring energy loss, its load end for be that (the general 3.2V of lithium iron monomer battery voltage is full of 3.65V for the monomer voltage of power brick, the general 3.7V of polymer lithium electricity monomer battery voltage is full of 4.25V), it is high that the DC commonly used as us turns DC input terminal voltage, output end voltage is low, it is also large that difference gets over lossy.Setting small area analysis 2.5A, because just not needing low-voltage to charge higher than 2.5A, because power brick is also less than balanced state, institute's ether big current is unactual, therefore is set in below 2.5A small area analysis.
See Fig. 2, the invention still further relates to a kind of battery pack distribution multi-mode equalization charging circuit, comprise switch module, battery pack, detection module, BMS module, handover module and charging module;
Described switch module high input voltage, big current, for switching high voltage, big current to batteries charging;
Described battery pack comprises the battery of multiple series connection;
Described detection module, for detecting the voltage of each battery in battery pack;
Described charging module, for generation of low-voltage, small area analysis;
Described handover module, charges to each single battery that in battery pack, all the other do not reach pre-set peak value voltage respectively for switching low-voltage, small area analysis;
Described BMS module, the voltage for detecting each battery according to detection module judges whether have single battery to reach pre-set peak value voltage in battery pack, if then control switch module, switches and stops high voltage, big current to batteries charging; Control handover module subsequently and low-voltage, low current charge are carried out to the single battery not reaching pre-set peak value voltage, until all battery charging completes in battery pack.
Visible, be different from that conventional charging circuit adopts be iterate through high voltage, big current charges to whole Battery pack group, the equalizing charge mode of cyclic approximation of cell electric discharge, beneficial effect of the present invention is: first by external high voltage, big current to the charging of whole group of battery pack, after having a battery to be filled in battery pack, then to transfer in battery pack that other switch to low-voltage less than cell, small area analysis mode is charged, till all batteries are all filled in battery pack to.The method not only comparable traditional approach more energy-conserving and environment-protective and fast effectively outside, and avoid the deviation accumulation effect that traditional charging modes brings due to the charging of cell, in addition the temperature rise that brings battery pack of charging process is low (eliminates the discharge resistance in traditional circuit, conductive discharge can generate heat), the use birthday noodle of battery pack are greatly extended.
Embodiment 2:
As shown in Figure 3, in above-mentioned, described detection module connects each battery in battery pack; BMS model calling detection module, BMS model calling switch module and handover module, in the corresponding battery pack of handover module, each battery is provided with a coupled branch road, and charging module connects handover module.
Detection module is used for by the situation (mainly voltage condition) of each cell to BMS module feedback, and then provides benchmark to make BMS module adjustment folding switch module switch the charging whether turning off high voltage, big current.Handover module then in corresponding battery pack each battery branch road is set respectively, convenient only to needing the battery of charging to carry out low-voltage, low current charge.
Embodiment 3:
In above-mentioned, described detection module comprises temperature detection, total voltage detection, voltage detecting branch road and current detecting; Wherein in the corresponding battery pack of temperature detection and voltage detecting branch road, each battery is arranged one by one.
In order to ensure safety, temperature detection, total voltage detection, voltage detecting branch road and current detecting is also provided with in detection module, and at least temperature detection is that corresponding each battery is arranged separately, for the charging temperature of battery each in monitoring battery group, prevent temperature overheating from producing dangerous.Total voltage detection and current detecting then can detect voltage, the current conditions of integral battery door group, and monitoring charging process also ensures charging safety.
Embodiment 4:
In above-mentioned, described charging module comprises DC-DC circuit.
As the typical scheme of one, charging module can adopt common DC-DC circuit, and it is simple that this circuit has structure, lower-cost advantage.
Embodiment 5:
Described switch module input connects high voltage, the large-current electric source of charging head; Described charging module input connects charging head 12V input head or accumulator of electric car.
Common charging electric vehicle head generally includes two groups of DC+DC-, wherein one group be used for transmit battery case charging high voltage, big current, another group then transmits 12V.Therefore relate to as one suggestion, the charging module input of this circuit can directly be connected with charging head 12V input head, thus meets application demand.Certainly, this input also directly can connect the storage battery output of electric automobile self.
Concrete example:
With common 384V, the power brick of 100Ah is example, and its gross power is 38.4kw, and the utilization rate of electrical of employing traditional approach equalizing charge is usually the highest can only reach about 82%, adopt the art of this patent then can reach 93-96%, the equalizing charge time is only 1/10 of traditional charging modes.And after employing the art of this patent, the temperature of power brick in charging process can be made to be not more than 35 degree.
Temperature just a kind of citing statement of the battery case in above-mentioned example, in fact maximum feature has indicated the advantage of its management system, and just temperature is low not have resistance monomer to discharge not, also energy can not be changed into heat and vapor away.Thus the efficiency reached than like product and fail safe.
The foregoing is only embodiments of the invention; not thereby the scope of the claims of the present invention is limited; every utilize specification of the present invention and accompanying drawing content to do equivalent structure or equivalent flow process conversion; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.
Claims (7)
1. a battery pack distribution multi-mode balanced charging method, is characterized in that: comprise step,
A) employing high voltage, big current charge to battery pack;
B) voltage of each battery in battery pack is detected;
C) judge in battery pack, whether have single battery to reach pre-set peak value voltage, if then perform step D;
D) stop high voltage, big current to batteries charging;
E) judge whether have single battery not reach pre-set peak value voltage in battery pack, to be perform step F, otherwise charging terminates;
F) low-voltage, small area analysis is adopted to charge to each single battery that in battery pack, all the other do not reach pre-set peak value voltage respectively;
G) judge in battery pack, in all the other single batteries, whether have battery to reach pre-set peak value voltage, if having, perform step H;
H) stopping low-voltage, small area analysis charge to this single battery, return step e.
2. battery pack distribution multi-mode balanced charging method as claimed in claim 1, it is characterized in that: described high voltage is corresponding with assembled battery total voltage, described big current allows charging current corresponding with battery pack entirety; Described low-voltage is not more than 2.5A higher than 24V, small area analysis; The nominal voltage value of single battery in described pre-set peak value Voltage Reference battery pack.
3. a battery pack distribution multi-mode equalization charging circuit, is characterized in that: comprise switch module, battery pack, detection module, BMS module, handover module and charging module;
Described switch module high input voltage, big current, for switching high voltage, big current to batteries charging;
Described battery pack comprises the battery of multiple series connection;
Described detection module, for detecting the voltage of each battery in battery pack;
Described charging module, for generation of low-voltage, small area analysis;
Described handover module, charges to each single battery that in battery pack, all the other do not reach pre-set peak value voltage respectively for switching low-voltage, small area analysis;
Described BMS module, the voltage for detecting each battery according to detection module judges whether have single battery to reach pre-set peak value voltage in battery pack, if then control switch module, switches and stops high voltage, big current to batteries charging; Control handover module subsequently and low-voltage, low current charge are carried out to the single battery not reaching pre-set peak value voltage, until all battery charging completes in battery pack.
4. battery pack distribution multi-mode equalization charging circuit as claimed in claim 3, is characterized in that: described detection module connects each battery in battery pack; BMS model calling detection module, BMS model calling switch module and handover module, in the corresponding battery pack of handover module, each battery is provided with a coupled branch road, and charging module connects handover module.
5. battery pack distribution multi-mode equalization charging circuit as claimed in claim 4, is characterized in that: described detection module comprises temperature detection, total voltage detection, voltage detecting branch road and current detecting; Wherein in the corresponding battery pack of temperature detection and voltage detecting branch road, each battery is arranged one by one.
6. battery pack distribution multi-mode equalization charging circuit as claimed in claim 3, is characterized in that: described charging module comprises DC-DC circuit.
7. battery pack distribution multi-mode equalization charging circuit as claimed in claim 3, is characterized in that: described switch module input connects high voltage, the large-current electric source of charging head; Described charging module input connects charging head 12V input head or accumulator of electric car.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105375585A (en) * | 2015-12-14 | 2016-03-02 | 四川长虹电源有限责任公司 | Airborne lithium battery charger and charging method |
| CN106300587A (en) * | 2016-09-06 | 2017-01-04 | 韩振铎 | A kind of field lithium battery charging device and method |
| CN106451588A (en) * | 2016-07-14 | 2017-02-22 | 苏州新逸喆电子科技有限公司 | Lithium battery pack equalizing charging method |
| CN108604811A (en) * | 2016-10-21 | 2018-09-28 | 株式会社Lg化学 | Battery balancing system and control method |
| CN108604810A (en) * | 2016-10-21 | 2018-09-28 | 株式会社Lg化学 | Device and method for providing charging voltage |
| CN110601296A (en) * | 2019-09-19 | 2019-12-20 | 江西恒动新能源有限公司 | Active equalization circuit of battery management system |
| CN111614134A (en) * | 2020-04-23 | 2020-09-01 | 北京欧罗科技发展有限公司 | Battery pack charging control method and system and battery pack charging device |
| CN112968226A (en) * | 2021-02-04 | 2021-06-15 | 河南克能新能源科技有限公司 | Capacity restoration method for laggard single-cell battery pack |
| CN114336805A (en) * | 2020-09-30 | 2022-04-12 | 比亚迪股份有限公司 | Battery pack charging device and charging method |
| CN117375183A (en) * | 2023-12-05 | 2024-01-09 | 深圳市易检车服科技有限公司 | Battery balance management method |
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| CN105375585A (en) * | 2015-12-14 | 2016-03-02 | 四川长虹电源有限责任公司 | Airborne lithium battery charger and charging method |
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| CN106451588A (en) * | 2016-07-14 | 2017-02-22 | 苏州新逸喆电子科技有限公司 | Lithium battery pack equalizing charging method |
| CN106300587A (en) * | 2016-09-06 | 2017-01-04 | 韩振铎 | A kind of field lithium battery charging device and method |
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| CN112968226A (en) * | 2021-02-04 | 2021-06-15 | 河南克能新能源科技有限公司 | Capacity restoration method for laggard single-cell battery pack |
| CN117375183A (en) * | 2023-12-05 | 2024-01-09 | 深圳市易检车服科技有限公司 | Battery balance management method |
| CN117375183B (en) * | 2023-12-05 | 2024-03-19 | 深圳市易检车服科技有限公司 | Battery balance management method |
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Application publication date: 20150429 |